Why doesn't the blog always send emails to my subscribers?

I've spoken with my followers and they tell me that the emails they're getting reminding them to read the blog are sporadic at best. Maybe they'll get one and then miss two and then get another one. I want to know why. All my people should be receiving timely emails when I post new content. Also, I've had difficulty with the 'share' on facebook. Half the time it posts and the other half the time it doesn't. I think you should have a developer look at the code again. Something isn't working properly. Please reply with REAL response and not some cut-paste form answer. Thank you.
-Justin
Blog url: http://justinstump.wordpress.com/